Elevator



UNITED STATES I PATENT OFFrce.

JAMES M. THAYER, OF RANDOLPH, MASSACHUSETTS.

ELEVATO R.

SPECIFICATION forming part of Letters Patent No. 229,203, dated June 22, 1880.

Application filed February 2, i880.

To all whom it may concern:

Be it known that I, J AMES MINOT THAYER, of Randolph, inthe county of Norfolk and State of Massachusetts, have invented a new and useful Improvement in Elevators, of which the following is a specification.

Figure 1 is a side elevation, partly in section, of the improvement. Fig. 2 is a sectional elevation' taken through the line was, Fig. 1. Fig. 3 is a bottom view. Fig. 4 is a side elevation of one of the wedges. Fig. 5 is aface view of one of the wedges. Fig. 6 of the drawings is a side elevation of a disk, 0, with its connections, and broken away to show a notched disk, M.

The object of this invention is to furnish elevators so constructed that they will be stopped and prevented from falling should the hoisting apparatus break or in any manner become disarranged.

Similar letters of reference indicate corresponding parts.

A represents the frame of the elevator-well, within which the cage or carriage moves up and down. B is the frame of the cage or carriage, between the posts of which and the posts A are interposed long wedges G, placed small end upward.

The wedges G are beveled upon their inner sides, and the cage-posts B are beveled upon their outer sides and in the reverse direction from the wedges C, so that the wedges C may be pushed squarely against the well-posts A, and may thus bear evenly against the said posts A to give an even pressure from top to bottom and prevent any jar in binding. To the upper ends of the wedges G are attached arms D, which, when the said wedges hang free, rest upon the upper ends of the posts B, so

that the wedges may be carried up and down by and with the cage.

The cage B is kept vertical while moving up and down by arms or plates E, attached to the cage-posts B, and which overlap the inner sides of the well-posts A.

The cage B is entered within the well A by small rollers F, attached to the cage-posts B, and which rest against and roll along the inner sides of the posts A.

With this construction, should the hoisting apparatus break, or from any other cause allow Upon the top of the cage B is placed a cross-- bar, G, to which the hoisting ropes or chains are attached. The ends of the cross-bar G are attached to the upper ends of rods H, which pass down through holes in the side cross-bars of the cage B. To the rods H, or to collars formed upon or attached to the said rods, are hinged pairs of jointed rods I, the outer parts or sections of which pass through and work in holes in the posts B, and which, when the rods H slide downward, act as toggle-joints to force the ends of the said outer parts or sections against the inner sides of the wedges (J,

pressing the said wedges against the posts A, so that they may be wedged between the posts A B to stop the descent of the cage.

The rods H are drawn downward as soon as the upward draft upon them is stopped by the coiled springs J, placed upon their lower parts and interposed between the headsformed upon or attached to the lower ends of the said rods H and cross-bars of the frame B. The springs J also receive the first strain when the hoisting power is applied, and thus cause the cage to start gently.

K is a rod, which works in guides in the lower part of the cage B, and has a knob or other handle attached to its upper end for convenience in operating it. To the lower end of the rod K, below the platform of the cage B, is hinged the end of a bar, L, the other end of whichis hinged to a support attached to the lower side of the cage-platform.

To the barLis attached, or upon itis formed, a flange or projection, S, to engage within a notch, T, in a wheel or disk, M, rigidly attached to a shaft, N, which works in bearings attached to the cage-frame B. To the end parts of the shaft N are attached two wheels or disks, O,'to the opposite parts of each of which are pivoted the inner ends of two jointed rods, P. The outer parts or sections of the rods P pass through guides attached to the cage-frame B, and through holes in the lower parts of the cage-posts B, so that by turning the shaft N the rods P will be projected to press the wedges (J against the posts A, and thus stop the descent of the cage.

The catch-wheel M may be attached to or formed upon the crank-wheel 0, if desired.

The shaft Nis turned to project the rods P, when the catch-bar L is raised, by a spiral spring, Q, placed upon the said shaft N.

One end of the spring Q is attached to the catch-wheel M, and its other end is attached to a bearing, N, for the shaft N.

The catch-bar L is held down upon the catchwheel M by a spring, R, interposed between the said catch-bar and the platform of the cage B. This device is intended for use only when the ordinary checking device gets out of order, or when some accident happens that requires the descent of the cage to be stopped while the hoisting apparatus continues to operate.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. The arms D, combined with frame B and wedges O, as and for the'purpose described.

2. In an elevator, the combination, with the cage-frame B, the wedges O, and the cross-bar G, of the sliding rods H, the jointed rods l, and the springs J, substantially as herein shown and described,whereby the wedges G will be pressed out against the well-postsA should the hoisting apparatus become disconnected, as set forth.

3. In an elevator, the combination, with the cage B and the wedges O, of the rod K, the spring catch-bar L R, the catch-wheel M, the shaft N, the crank-wheels O, the jointed rods P, and the spring Q, substantially as herein shown and described, whereby the descent of the cage may be stopped at the will of the operator, as set forth.

4.. The cage B, centered within the well A by rolls F on posts B, and provided with plates E, as and for the purpose specified.

JAMES M. THAYER.

Witnesses:

G. W. HAWES, O. A. THAYER. 

